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8c48f179 UH |
1 | /* |
2 | * This file is part of the sigrok project. | |
3 | * | |
4 | * Copyright (C) 2011 Uwe Hermann <uwe@hermann-uwe.de> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <stdlib.h> | |
22 | #include <string.h> | |
23 | #include <glib.h> | |
cd315a80 UH |
24 | #include "sigrok.h" |
25 | #include "sigrok-internal.h" | |
8c48f179 UH |
26 | |
27 | struct context { | |
28 | unsigned int num_enabled_probes; | |
29 | unsigned int unitsize; | |
30 | char *probelist[SR_MAX_NUM_PROBES + 1]; | |
31 | uint64_t trigger_point; | |
32 | uint64_t samplerate; | |
33 | }; | |
34 | ||
35 | /** | |
36 | * Check if the given samplerate is supported by the LA8 hardware. | |
37 | * | |
38 | * @param samplerate The samplerate (in Hz) to check. | |
39 | * @return 1 if the samplerate is supported/valid, 0 otherwise. | |
40 | */ | |
41 | static int is_valid_samplerate(uint64_t samplerate) | |
42 | { | |
43 | unsigned int i; | |
44 | ||
45 | for (i = 0; i < 255; i++) { | |
46 | if (samplerate == (SR_MHZ(100) / (i + 1))) | |
47 | return 1; | |
48 | } | |
49 | ||
b08024a8 UH |
50 | sr_warn("la8 out: %s: invalid samplerate (%" PRIu64 "Hz)", |
51 | __func__, samplerate); | |
8c48f179 UH |
52 | |
53 | return 0; | |
54 | } | |
55 | ||
56 | /** | |
57 | * Convert a samplerate (in Hz) to the 'divcount' value the LA8 wants. | |
58 | * | |
59 | * LA8 hardware: sample period = (divcount + 1) * 10ns. | |
60 | * Min. value for divcount: 0x00 (10ns sample period, 100MHz samplerate). | |
61 | * Max. value for divcount: 0xfe (2550ns sample period, 392.15kHz samplerate). | |
62 | * | |
63 | * @param samplerate The samplerate in Hz. | |
64 | * @return The divcount value as needed by the hardware, or 0xff upon errors. | |
65 | */ | |
66 | static uint8_t samplerate_to_divcount(uint64_t samplerate) | |
67 | { | |
68 | if (samplerate == 0) { | |
b08024a8 | 69 | sr_warn("la8 out: %s: samplerate was 0", __func__); |
8c48f179 UH |
70 | return 0xff; |
71 | } | |
72 | ||
73 | if (!is_valid_samplerate(samplerate)) { | |
b08024a8 UH |
74 | sr_warn("la8 out: %s: can't get divcount, samplerate invalid", |
75 | __func__); | |
8c48f179 UH |
76 | return 0xff; |
77 | } | |
78 | ||
79 | return (SR_MHZ(100) / samplerate) - 1; | |
80 | } | |
81 | ||
82 | static int init(struct sr_output *o) | |
83 | { | |
84 | struct context *ctx; | |
85 | struct sr_probe *probe; | |
86 | GSList *l; | |
87 | int num_probes; | |
88 | uint64_t samplerate; | |
89 | ||
90 | if (!o) { | |
b08024a8 | 91 | sr_warn("la8 out: %s: o was NULL", __func__); |
8c48f179 UH |
92 | return SR_ERR_ARG; |
93 | } | |
94 | ||
95 | if (!o->device) { | |
b08024a8 | 96 | sr_warn("la8 out: %s: o->device was NULL", __func__); |
8c48f179 UH |
97 | return SR_ERR_ARG; |
98 | } | |
99 | ||
100 | if (!o->device->plugin) { | |
b08024a8 | 101 | sr_warn("la8 out: %s: o->device->plugin was NULL", __func__); |
8c48f179 UH |
102 | return SR_ERR_ARG; |
103 | } | |
104 | ||
105 | if (!(ctx = calloc(1, sizeof(struct context)))) { | |
b08024a8 | 106 | sr_warn("la8 out: %s: ctx calloc failed", __func__); |
8c48f179 UH |
107 | return SR_ERR_MALLOC; |
108 | } | |
109 | ||
110 | o->internal = ctx; | |
111 | ||
112 | /* Get the number of probes, their names, and the unitsize. */ | |
113 | /* TODO: Error handling. */ | |
114 | for (l = o->device->probes; l; l = l->next) { | |
115 | probe = l->data; | |
116 | if (!probe->enabled) | |
117 | continue; | |
118 | ctx->probelist[ctx->num_enabled_probes++] = probe->name; | |
119 | } | |
120 | ctx->probelist[ctx->num_enabled_probes] = 0; | |
121 | ctx->unitsize = (ctx->num_enabled_probes + 7) / 8; | |
122 | ||
123 | num_probes = g_slist_length(o->device->probes); | |
124 | ||
125 | if (sr_device_has_hwcap(o->device, SR_HWCAP_SAMPLERATE)) { | |
126 | samplerate = *((uint64_t *) o->device->plugin->get_device_info( | |
127 | o->device->plugin_index, SR_DI_CUR_SAMPLERATE)); | |
128 | /* TODO: Error checks. */ | |
129 | } else { | |
130 | samplerate = 0; /* TODO: Error or set some value? */ | |
131 | } | |
132 | ctx->samplerate = samplerate; | |
133 | ||
134 | return 0; /* TODO: SR_OK? */ | |
135 | } | |
136 | ||
137 | static int event(struct sr_output *o, int event_type, char **data_out, | |
138 | uint64_t *length_out) | |
139 | { | |
140 | struct context *ctx; | |
141 | char *outbuf; | |
142 | ||
143 | if (!o) { | |
b08024a8 | 144 | sr_warn("la8 out: %s: o was NULL", __func__); |
8c48f179 UH |
145 | return SR_ERR_ARG; |
146 | } | |
147 | ||
148 | if (!(ctx = o->internal)) { | |
b08024a8 | 149 | sr_warn("la8 out: %s: o->internal was NULL", __func__); |
8c48f179 UH |
150 | return SR_ERR_ARG; |
151 | } | |
152 | ||
153 | if (!data_out) { | |
b08024a8 | 154 | sr_warn("la8 out: %s: data_out was NULL", __func__); |
8c48f179 UH |
155 | return SR_ERR_ARG; |
156 | } | |
157 | ||
158 | switch (event_type) { | |
159 | case SR_DF_TRIGGER: | |
b08024a8 | 160 | sr_dbg("la8 out: %s: SR_DF_TRIGGER event", __func__); |
8c48f179 UH |
161 | /* Save the trigger point for later (SR_DF_END). */ |
162 | ctx->trigger_point = 0; /* TODO: Store _actual_ value. */ | |
163 | break; | |
164 | case SR_DF_END: | |
b08024a8 | 165 | sr_dbg("la8 out: %s: SR_DF_END event", __func__); |
8c48f179 | 166 | if (!(outbuf = malloc(4 + 1))) { |
b08024a8 | 167 | sr_warn("la8 out: %s: outbuf malloc failed", __func__); |
8c48f179 UH |
168 | return SR_ERR_MALLOC; |
169 | } | |
170 | ||
171 | /* One byte for the 'divcount' value. */ | |
172 | outbuf[0] = samplerate_to_divcount(ctx->samplerate); | |
173 | // if (outbuf[0] == 0xff) { | |
b08024a8 | 174 | // sr_warn("la8 out: %s: invalid divcount", __func__); |
8c48f179 UH |
175 | // return SR_ERR; |
176 | // } | |
177 | ||
178 | /* Four bytes (little endian) for the trigger point. */ | |
179 | outbuf[1] = (ctx->trigger_point >> 0) & 0xff; | |
180 | outbuf[2] = (ctx->trigger_point >> 8) & 0xff; | |
181 | outbuf[3] = (ctx->trigger_point >> 16) & 0xff; | |
182 | outbuf[4] = (ctx->trigger_point >> 24) & 0xff; | |
183 | ||
184 | *data_out = outbuf; | |
185 | *length_out = 4 + 1; | |
186 | free(o->internal); | |
187 | o->internal = NULL; | |
188 | break; | |
189 | default: | |
b08024a8 UH |
190 | sr_warn("la8 out: %s: unsupported event type: %d", __func__, |
191 | event_type); | |
8c48f179 UH |
192 | *data_out = NULL; |
193 | *length_out = 0; | |
194 | break; | |
195 | } | |
196 | ||
197 | return SR_OK; | |
198 | } | |
199 | ||
200 | static int data(struct sr_output *o, const char *data_in, uint64_t length_in, | |
201 | char **data_out, uint64_t *length_out) | |
202 | { | |
203 | struct context *ctx; | |
204 | char *outbuf; | |
205 | ||
206 | if (!o) { | |
b08024a8 | 207 | sr_warn("la8 out: %s: o was NULL", __func__); |
8c48f179 UH |
208 | return SR_ERR_ARG; |
209 | } | |
210 | ||
211 | if (!(ctx = o->internal)) { | |
b08024a8 | 212 | sr_warn("la8 out: %s: o->internal was NULL", __func__); |
8c48f179 UH |
213 | return SR_ERR_ARG; |
214 | } | |
215 | ||
216 | if (!data_in) { | |
b08024a8 | 217 | sr_warn("la8 out: %s: data_in was NULL", __func__); |
8c48f179 UH |
218 | return SR_ERR_ARG; |
219 | } | |
220 | ||
221 | if (!(outbuf = calloc(1, length_in))) { | |
b08024a8 | 222 | sr_warn("la8 out: %s: outbuf calloc failed", __func__); |
8c48f179 UH |
223 | return SR_ERR_MALLOC; |
224 | } | |
225 | ||
226 | memcpy(outbuf, data_in, length_in); | |
227 | ||
228 | *data_out = outbuf; | |
229 | *length_out = length_in; | |
230 | ||
231 | return SR_OK; | |
232 | } | |
233 | ||
234 | struct sr_output_format output_chronovu_la8 = { | |
235 | .id = "chronovu-la8", | |
236 | .description = "ChronoVu LA8", | |
237 | .df_type = SR_DF_LOGIC, | |
238 | .init = init, | |
239 | .data = data, | |
240 | .event = event, | |
241 | }; |